The only firmware that works is OS 4.2.1.66 from what I've been able to tell. It's available for the 8100 and 8700, not sure about the 8800s. I have a 8300 and 8700. I can get it to pair, voice and data, with the 8700 (with OS 4.2.1.66), but no luck with the 8300.
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